A color expression that indicates the background color for the control's header.
The last 7 bits in the high significant byte of the color to indicates the
identifier of the skin being used. Use the Add
method to add new skins to the control. If you need to remove the skin
appearance from a part of the control you need to reset the last 7 bits in the
high significant byte of the color being applied to the background's part.

The current line displays a different background color
if the BackColorCaretLine property is not 0. By default, the
BackColorCaretLine property is 0. If the BackColorCaretLine property is 0 it
has no visual effect. Use the BackColorALternate
to display alternate lines in the control. Use the BackColor
property to specify the control's background color. Use the CaretLine
property to specify the line where the caret is.